> a) elfload.c:859 > > #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned > long)(TARGET_ELF_EXEC_PAGESIZE-1)) > > This means that for 64bit guest on a 32bit host the _v's value is > silently reduced to 32bit, the cast should be abi_ulong. > > b) mmap.c:428 > > real_start = start & qemu_host_page_mask; > > Same thing basically qemu_host_page_mask is unsigned long and so > the upper bits are sliently cleared. Again qemu_host_page_mask > should probably be abi_ulong. > > The above two make elf binary with one of the segments above 4G load > and run on 32bit guest only to fail well into execution and without > any indication that it shouldn't have been allowed to run in the first > place.
I'd be amazed if these are the only two issues, and expect 64-bit guests on 32-bit hosts to be generally unsafe. Paul
